package com.sky.service.impl;


import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**导出近30天的运营数据报表
     * @param response
     **/
    public void exportBusinessData(HttpServletResponse response) {
        // 相对当前一天，往前推 30 天
        LocalDate begin = LocalDate.now().minusDays(30);
        // 相对当前一天，往前推 1 天，即昨天 【不使用今天的原因：今天还没有结束，数据还可能会发生变化】
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        }catch (IOException e){
            e.printStackTrace();
        }
    }

    /**
     * 统计销量前十的菜品数据
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO top10(LocalDate begin, LocalDate end){
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        // 查询销量前十的菜品数据
        Map map = new HashMap();
        map.put("beginTime", beginTime);
        map.put("endTime", endTime);
        map.put("status", Orders.COMPLETED);

        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.top10(map);

//        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);
        System.out.println(goodsSalesDTOList);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    private List<LocalDate> getDateList(LocalDate begin,LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }
    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO orderStatistics(LocalDate begin, LocalDate end){
        // 获取日期列表
        List<LocalDate> dateList = getDateList(begin, end);

        //每日订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //每日有效订单总数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("beginTime", beginTime);
            map.put("endTime", endTime);
            // 查询每日订单总数
            // select count(id) from orders where create_time >= beginTime and create_time <= endTime
            Integer ordersCount = orderMapper.getOrdersCount(map);
            // 查询每日有效订单总数
            // select count(id) from orders where create_time >= beginTime and create_time <= endTime
            // and status = 5[已完成]
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.getOrdersCount(map);
            orderCountList.add(ordersCount);
            validOrderCountList.add(validOrderCount);
        }
        // 在一定期间的天数中 ： 订单总数  有效订单总数  订单完成率
        // 使用集合流来算总和
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer totalValidOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = totalValidOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCompletionRate(orderCompletionRate)
                .orderCountList(StringUtils.join(orderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(totalValidOrderCount)
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .build();
    }
    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end){
        /**
         * //日期，以逗号分隔，例如：2022-10-01,2022-10-02,2022-10-03
         *     private String dateList;
         *     //用户总量，以逗号分隔，例如：200,210,220
         *     private String totalUserList;
         *     //新增用户，以逗号分隔，例如：20,21,10
         *     private String newUserList;
         */
        //获取日期列表
        List<LocalDate> dateList = getDateList(begin,end);

        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> newUserList = new ArrayList<>();

        //获取用户总量
        //获取每日新增的用户量
        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);

            //动态查询
            Map map = new HashMap();
            map.put("endTime",endTime);
            //查询用户总量
            // select count(id) from user where create_time <= {#endTime}
            Integer totalNumber = userMapper.getUserCount(map);
            //查询每日新增的用户量
            map.put("beginTime",beginTime);
            //select count(id) from user where create_time >= {#beginTime} and
            // create_time <= {#endTime}
            Integer newNumber = userMapper.getUserCount(map);

            totalUserList.add(totalNumber);
            newUserList.add(newNumber);
        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }
    /**
     * 统计营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        /**
         *    //日期，以逗号分隔，例如：2022-10-01,2022-10-02,2022-10-03
         *     private String dateList;
         *
         *     //营业额，以逗号分隔，例如：406.0,1520.0,75.0
         *     private String turnoverList;
         */
//        //先计算 begin  --- end 这段时间，用集合存储，然后将集合转成字符串
//        List<LocalDate> dateList = new ArrayList<>();
//        //先添加起始时间到集合中
//        dateList.add(begin);
//        //其次，利用while循环，将begin到end之间的所有时间都添加到集合中
//        while (!begin.equals(end)){
//            begin = begin.plusDays(1);
//            dateList.add(begin);
//        }

        //获取日期列表
        List<LocalDate> dateList = getDateList(begin,end);

        //获取营业额列表
        List<Double> turnoverList = new ArrayList();
        //根据时间查询每天的营业额，订单状态为已完成 = 5
        // for循环进行遍历
        for (LocalDate localDate : dateList) {
            // select sum(amount) from orders where status = 5 and create_time <= 当天的23:59:59
            // and create_time >= 当前的 0:0:0
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            // 利用对象为map 查询【类似 Object】
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("beginTime", beginTime);
            map.put("endTime", endTime);

            Double turnover = orderMapper.sumByMap(map);
            // 要判断营业额是否为null的情况
            turnover = turnover != null ? turnover : 0.0;
            turnoverList.add(turnover);
        }


        //将集合转成字符串
//        String dateLt = StringUtils.join(dateList, ",");
        System.out.println(dateList);
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }
}
